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HIV/AIDS: Receptor, Target Cell, Vaccine

What is the method for attachment for HIV (key receptor)?

What is the principal target cell?

Why hasn't a vaccine been developed?

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The target cell for HIV is the helper T-cell (also called T4, CD4, or T-helper lymphocyte). The key receptor for HIV is a glycoprotein on the surface of these T-cells called CD4.

Scientists are trying to ...